4.8 Wiring
4.8.1 Wiring structure
The two leads which serve as the bus shall be located in the same cable or cable conduit. In the cable or cable conduit the two leads shall be next to each other in order to prevent unintended coupling to other signals.
NOTE Depending on local installation directives and insulation requirements the two wires can be located in the same cable as the mains power supply leads.